Results 51 to 60 of about 3,903 (221)

Torsional oscillations within a magnetic pore in the solar photosphere [PDF]

, 2021
Spectropolarimetric observations of a solar pore at high temporal and spatial resolution identify the presence of magnetic field torsional oscillations.
Boocock C., Nelson C. J., Stangalini M., Del Moro D., Korsos M. B., Erdelyi R., Tsiklauri D., Berrilli F.   +7 more
core   +1 more source

High-resolution Observations of a C9.3 White-light Flare and Its Impact on the Solar Photosphere

The Astrophysical Journal Letters
We present a detailed analysis of a C9.3 white-light flare using high-resolution observations from the New Vacuum Solar Telescope. The flare occurred near the eastern solar limb on 2023 September 11, within NOAA AR 13431, and produced beam electrons with
Zhe Xu, Xiaoli Yan, Zhentong Li, Liheng Yang, Zhike Xue, Jincheng Wang, Yian Zhou   +6 more
doaj   +1 more source

Coronal heating and wind acceleration by nonlinear Alfvén waves – global simulations with gravity, radiation, and conduction [PDF]

Nonlinear Processes in Geophysics, 2008
We review our recent results of global one-dimensional (1-D) MHD simulations for the acceleration of solar and stellar winds. We impose transverse photospheric motions corresponding to the granulations, which generate outgoing Alfvén waves.
T. K. Suzuki
doaj  

Spectral Irradiance Observations and Projections for Solar Cycle 25

Earth and Space Science, Volume 13, Issue 4, April 2026.
Abstract The Ozone Monitoring Instrument (OMI) on the Aura satellite makes near‐daily measurements of solar spectral irradiance (SSI) at wavelengths between 265 and 500 nm for instrument calibration purposes. The low degradation and exceptional stability of OMI's calibration during its lifetime facilitates the creation of a new 18‐year OMI Version 7 ...
Matthew T. DeLand, Sergey V. Marchenko, Judith L. Lean, Odele Coddington   +3 more
wiley   +1 more source

Photospheric Faculae and the Solar Oblateness [PDF]

The Astrophysical Journal, 1972
Photospheric faculae near the equatorial solar limb may provide the excess brightness which Ingersoll and Spiegel showed would explain Dicke and Goldenberg's oblateness measurement. Three lines of evidence support this statement: (1) the excess emission of faculae may arise in optically thin regions, as required by the Ingersoll-Spiegel hypothesis; (
Chapman, Gary A., Ingersoll, Andrew P.
openaire   +2 more sources

MHD simulations of the solar photosphere [PDF]

, 2012
We briefly review the observations of the solar photosphere and pinpoint some open questions related to the magnetohydrodynamics of this layer of the Sun. We then discuss the current modelling efforts, addressing among other problems,
T. Roudier, M. Rieutord, F. Rincon
core   +1 more source

Photospheric Swirls in a Quiet-Sun Region

The Astrophysical Journal
Swirl-shaped flow structures have been observed throughout the solar atmosphere, in both emission and absorption, at different altitudes and locations, and are believed to be associated with magnetic structures. However, the distribution patterns of such
Quan Xie, Jiajia Liu, Chris J. Nelson, Robert Erdélyi, Yuming Wang   +4 more
doaj   +1 more source

Reconstruction of Two‐Dimensional Magnetohydrodynamic and Hall Magnetohydrodynamic Equilibria in Space Using Physics‐Informed Neural Networks

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 2, April 2026.
Abstract We present a novel data analysis technique based on physics‐informed neural networks (PINNs) to reconstruct two‐dimensional (2D) magnetohydrodynamic (MHD) and Hall MHD equilibria in a space plasma from in situ spacecraft measurements. Our method incorporates the steady‐state MHD or Hall MHD equations—a set of partial differential equations ...
Hiroshi Hasegawa, Eunjin Choi, Kyoung‐Joo Hwang, Kyunghwan Dokgo   +3 more
wiley   +1 more source

Wavelet analysis of spatial coherent structures in the photosphere [PDF]

, 1999
In this work we present some applications of wavelet analysis to the dynamics of the photosphere as obtained from a good serie of high spatial resolution white light images taken at the Vacuum Tower Telescope (VTT) at the NSO/SPO in October 1996. The use
Berrilli, F, Bruno, R, Bavassano, B., PIETROPAOLO, Ermanno, Straus, T, Cauzzi, G, Smaldone, LA, Consolini, G   +7 more
core  

High-resolution observations of the solar photosphere, chromosphere, and transition region [PDF]

, 2020
NASA’s Interface Region Imaging Spectrograph (IRIS) provides high-resolution observations of the solar atmosphere through ultraviolet spectroscopy and imaging.
de Pontieu, B., Scharmer, G. B., Scharmer, G., Scharmer, Göran B.,, Sainz Dalda, A., Rouppe van der Voort, L. H. M., Kleint, L., M. M. Woods, B. De Pontieu, A. Sainz Dalda, Gošić, M., Henriques, V., S. Jafarzadeh, Skogsrud, H., Dalda, A. Sainz, G. Chintzoglou, J. Martínez-Sykora, Jafarzadeh, S., A. Popovas, L. H. M. Rouppe van der Voort, M. Szydlarski, G. B. Scharmer, M. Gošić, Szydlarski, M., Graham, D., Hansteen, V. H., Scullion, Eamon, de La Cruz Rodríguez, J., C. Quintero Noda, Carlsson, M., R. Timmons, van der Voort, L. H. M. Rouppe, Kohutova, P., Pereira, T., Hansteen, V., S. Bose, L. Kleint, G. J. M. Vissers, Noda, C. Quintero, Woods, M. M., J. de la Cruz Rodríguez, Zacharias, P., Vissers, G. J. M., Chintzoglou, G., D. Nóbrega-Siverio, V. H. Hansteen, Vissers, G., Schmit, D., Pereira, T. M. D., de la Cruz Rodríguez, Jaime,, M. Carlsson, V. M. J. Henriques, Rouppe van Der Voort, L., Scullion, E., T. Leifsen, Drews, A., D. R. Graham, Nóbrega-Siverio, D., A. Drews, P. Kohutova, A. Ortiz, Martínez-Sykora, J., E. Scullion, Quintero Noda, C., H. Skogsrud, J. Joshi, P. Zacharias, Leifsen, T., D. Schmit, Henriques, V. M. J., Froment, C., Bose, S., Joshi, J., Ortiz, A., Vissers, Gregal J. M.,, T. M. D. Pereira, Timmons, R., C. Froment, Popovas, A., Woods, M., Graham, D. R.   +80 more
core   +1 more source